Portable tool



G. L. KRABER.

PORTABLE TOOL. APPLICATION FILED APR. 1?. 1918.

fnuznfor Gear L Kraber.

UNITEDIFSTATE'S PATENT OFFICE.

. GEORGE L. KRAIBER OF PORTLAND, OREGON, A SSIGNOR, BY MESNE ASSIGNMENTS,

TO THE TURBINE AIRTOOL COMPANY, 02 CLEVELAND, OHIO, A CORPORATION or onro.

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' Application filed April 17,

ing tool on a support which is adapted to be moved over the surface to be worked, and holds the knives of the planing tool in proper relation with such surface.

In putting my invention into practice I prefer to support the planing tool in a single casting having for the base a rear and forward shoe. The forward shoe slopes upward toward the outer end thereof, allowing for regulating the depth of cut of the knives of the planing tool. This regulation is determined by a runner fastened to the bottom face of the forward shoe and controlled by a thumb screw in the front end of the shoe.

My device also comprehends certain other detailed features of improvement as willbe hereinafter more broadly pointed out, including means for controlling the air to the turbine which constitutes the motor, and means for throwing off, or discharging, the shavings from the tool.

I attain these objects of my invention by the construction shown in the accompanying drawings, in which: 7 V

Figure l is a side elevation, partly in sec tion, of my device;

Fig. 2 is a frontelevation, partly in section; Y

Fig. 3 is a longitudinal section of the'rear handle of my. device, showing the air intake valve and controlling lever; and

Fig. 4 is a longitudinal section of the intake valve set within the handle.

My invention comprises a rotary cutterhead a, cored out and mounted on the shoulders b of two similar rotary turbine wheels 0,

one on each side, only one of these wheels appearing 1n the sectional v1ew of Fig. 2. These wheels are 111 turn mounted on shoulders cl in ball bearing seats e in the side plates f. The chambers g are an integral part of the frame it, and connect with the Specification of Letters Patent.

- PORTABLE rooL.

' Patented Jan. 25, 1921.

1918. Serial N0. 229,138.

cored-out section 2' (see Fig. 4) thereby forming the passageway for the fluid from the intake to the rotary wheels 0. The handle 7' is also a part of the frame h, and is provided with a valve is for regulating the flow of the compressed air to the rotary wheels 0. The stem of valve 70 is vertically reciprocable in the handle and projects above the same, so that the operator can readily control the valve, as by pressing on such stem with his thumb,without releasing his grasp on the handle.

The frame, or body it is made of elongate form so as to have an elongate and sufficient straight line bearing-face.

But at its end it the bearing-face is offset inward from said straight line, and preferably at an angle to the latter, as shown in F ig. 1. The end of the bearing-face so il set is covered by an adjustable shoeplate 41, having a rotary movement with the axis of rotation as at '0, that is close 'to the point where the knife-element comes into action. The free end of the shoe-plate u iscurved upward, as at w, for the purpose of adapting my planing tool to glide over uneven places n the surface being planed, and also to adapt my planing tool for planing convex and concave surfaces.

. The adjustable end of the shoe-plate u is provided with a rotatable screw 1 threaded in the body of the frame it, and provided with a lock nut 2.

The frame it cooperates with side plates f to substantially completely include the cutter head a save at the bottom where the cutter knives are allowed to project through to a depth equal to that of the cut desired to be made. Also at a point above and slightly to the front of the axis of the cutter head, having regard to the direction of movement of the tool when inuse, this inclosing portion of the frame is raised clear of the cutter head and left open at one side, so as to form a flaring discharge spout or hood for the chips or shavings. The escaping air from both rotary wheels 0 is obviously compressed and directed in its escape and so produces a sufiicient draft to effectively clear the cutter blades of the waste material referred to and discharge same to one side of the tool.

The detailed construction of the cutter head need not be described with greater particularity than above, since such construction forms the subject-matter of a separate c0- pending additional application filed Oct. '7, 1918, SenNo. 257,255.

scribed, a body or frame having a bearingface receding from a straight face at one end, an adjustable straight-face shoe plate overlying said receding straight face of the frame, the inner end of said shoe-plate lying in said straight face, the outer end of said shoe-plate being curved back over the front end of the frame, and means for adjusting the outer end of the shoe-plate relatively to said straight face of the frame.

3. In a tool of the character described,

an elongate body or frame, having a straight line bearing-face with one end offset inwardly from said straight line, a shoeplate covering said off-set end and having an angular adjustment with respect therei to, with the angle of rotation located close to the point where the knife-element comes into action, and means for adjusting the free end of said shoe-plate relatively to the straight face of said body. I

4. In. a tool of the character described, an elongate body or frame having a straight line bearing-face with one end off-set inwardly at an angle to said straight line, a shoe-plate covering said off-setend and having an angular adjustment with respect thereto, with the angle of rotation located close to the point where thevknife-element comes into action, and means for adjusting the free end of said shoe-plate relatively to the straight face of said body.

'5. In a tool of the character described, an elongate body or frame having a straight line bearing-face with one end off-set inwardly from said straight line, a shoe-plate covering said off-set end and having an angular adjustment with respect thereto,

with the angle of rotation located close to the point where the knife-element comes into action, and means for adjusting the free end of said shoe-plate relatively to the straight face of said body, the free end of said shoe-plate being curved back.-

6. In a tool of the character described,

' an elongate body or frame having a straight line bearing-face with one end off-set in wardly at an angleto said straight line, a shoe-plate covering said off-set end and having an angular adjustment with "respect thereto, with the angle of rotation located close to the point where the knife-element comes into action, and means for adjusting -the free end of said shoe-plate relatively to the straight face of said body, the free will clear said cutter head of waste material.

8. In a tool of the character described, the combination of a suitable frame, a rotary cutter head mounted therein, and two turbine wheels attached to said cutter head for rotating same, one on each side thereof, said frame inclosing said cutter head and wheels and being formed above with, a flaring laterally opening discharge spout, whereby the escaping fluid from said wheel will clear said cutter vhead of waste material. 1

9. In a tool of the character described, the combination of a suitable frame, a rotary cutter head mounted therein, a turbine wheel attached .to saidcutter head for rotating the same, said frame being provided with a handle at one end and with a passageway for the compressed fluid designed to operate said wheel disposed adj a cent to said handle, a valve controlling said passageway, and a stem on said valve reciprocable in said handle and extending beyond same so as to be operable by the hand grasping said handle.

GEORGE L. KRABER. 

